Jon Sibal is pretty amazing as an artist. You guys should check out his other work on Deviantart. Here is his info on his blog about the rendering:
JONSIBAL Blog Archive WIDEBODY Z34 He also happens to work as an inker on Superman.
As for the Tamon Design kit. I love the design and appreciate the organic nature of it. It does feel a bit Mazda to me, but then anything with those Geiger-esque curves does.